If the tiny mussel established itself here, it would create over $100 million worth of damage each year to dams, agriculture, salmon and more. From Tuesday to Friday afternoon, zebra mussel sightings have popped up in Washington state, as well as Wyoming, OregonColorado, Florida, Idaho, New York, Pennsylvania and Montana. “This has blown up,” Anderson says. A USGS employee said the agency has heard that at least 12 states have been affected as of Friday afternoon.

Source: Zebra mussels on Marimo moss balls are causing an emergency in WA | Crosscut